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Collections are a way for you to organize kata so that you can create your own training routines. Every collection you create is public and automatically sharable with other warriors. After you have added a few kata to a collection you and others can train on the kata contained within the collection.
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Whatever this kata improves, it was much mor fun to solve it, than boring "code all day to get an one digit answer" katas.
I really glad that this kata exists, it's just fresh air and why I prefer Codewars to Leetcode and other.
I don't get why is
variance("London", data) == 57.42(833333333374)while MATLAB shows me62.649- I also get this value by using1/n * sum((x_i - m)^2). What's wrong? What am I missing here?